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  #1  
Old 11-21-2019, 02:19 PM
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quadraped versus biped

When a baby is first born, he/she crawls using both legs and hands/arms for a period of time before learning how to stand and walk on his/her back hind legs.

Thinking in terms of evolution, might it be possible that man was first a quadraped and then over time morphed into a biped? Any ideas on how long ago this may have happened?

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  #2  
Old 11-21-2019, 03:02 PM
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Since we have a common ancestor with apes that would make sense.
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Old 11-21-2019, 06:09 PM
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At least 4 million years ago based on the age of "lucy".
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Old 11-21-2019, 07:58 PM
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hen they're first born, they don't really "crawl" as much as "slither." Though they're surprisingly mobile even right after birth -- a newborn left on its mother's belly will gradually move upwards to find one of two "lunch counters." It takes them about 30 minutes to attach and start eating, but the software is there.
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Old 11-22-2019, 08:55 PM
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Look up, “ontogeny recapitulates phylogeny” for an exhaustive discussion of the OP’s observation.
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Old 11-25-2019, 06:36 AM
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what I think is neat,is DNA has encoded memories from parent passed on to off spring.
Like they know to move north up her belly for milk.Or how primates know snakes are bad.
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Old 11-25-2019, 10:44 AM
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That would be neat if it were true.

Somethings can be passed like disease resistance. This called epigenetics, a lively topic of current research.

Most things operate under natural selection requiring change in the genotype. These things usually take many generations of selection and isolation from the general population.
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Old 11-25-2019, 12:33 PM
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Recent research shows that some of the learned things can be passed on to the next generation.
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  #9  
Old 11-25-2019, 09:05 PM
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Quote:
Originally Posted by t walgamuth View Post
Recent research shows that some of the learned things can be passed on to the next generation.
I think youíll find the results are not as clear as we are led to believe. Itís the old correlation-causation problem.
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Old 11-26-2019, 09:44 AM
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Quote:
Originally Posted by Botnst View Post
I think youíll find the results are not as clear as we are led to believe. Itís the old correlation-causation problem.
In science, nothing is....well in life too.
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  #11  
Old 11-26-2019, 10:09 AM
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Quote:
Originally Posted by oldsinner111 View Post
what I think is neat,is DNA has encoded memories from parent passed on to off spring.
Like they know to move north up her belly for milk.Or how primates know snakes are bad.
PBS Nature series had one where a dude lived with turkeys until they matured. Instincts told them to eat grasshoppers, avoid snakes, etc. After seeing that series, I thought about what parents pass on with out actually telling them. Would a great mechanical mind that moves to an apartment in a high rise pass those talents on to an offspring, but never see them put to use? Or a real intellect moving to a rural setting never see what was passed on to them.
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  #12  
Old 11-26-2019, 02:41 PM
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Some of this is being re-theorized over the past few years. Even Lucy's evolutionary time line is being questioned. Main, that recent finds in the same time frame are more advanced.
Also, what is innate and what is learned. There is a PBS special 'The People Who Walk Like Bears'. Basically, a family of mentally challenged who bear crawl in adult life. They never learned to walk upright. There was a intervention with parallel bars, to teach them to walk upright. One of them, did not participate in the training. He was shown walking at the end of the show.
There was a crane in Florida that would put a piece of bread to attract fish, then catch them. So, not learned from previous behavior.

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